Question

A boy is running towards a large plane mirror with a speed of 5 m/s. By what speed image will appear to be coming towards the boy?

• A. 5 m/s
  
• B. 10 m/s
  
• C. 15 m/s
  
• D. 0 m/s
  

Answer 1

The correct option is B 10 m/s


In a plane mirror, image and object are equidistant from the mirror.
Therefore, as the distance between the boy and the mirror decreases at a rate of 5 m/s, the boy’s image will also maintain the same distance from the mirror as that of the boy from the mirror.
Hence, the boy’s image will approach the plane mirror at a speed of 10 m/s.